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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

36384 results found.

  1. GRB 060418: REM candidate afterglow
  2. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  3. GRB 060413: REM NIR Observations
  4. GRB 060413: Refined analysis of the Swift-BAT burst
  5. GRB 060413: Watcher UBVR observations
  6. GRB 060413: XRT refined analysis
  7. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  8. GRB 060413: Swift detection of a burst
  9. GRB060403: optical observations
  10. GRB 060403 Optical observations
  11. GRB 060403: MITSuME optical observation
  12. GRB060403: XRT refined analysis
  13. GRB 060403: Swift/UVOT upper limits
  14. GRB 060403: Refined analysis of the Swift-BAT burst
  15. GRB 060403: Swift detection of a burst
  16. GRB 060322: LNA optical limit
  17. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  18. GRB 060323 : WIDGET simultaneous optical observations
  19. GRB 060323: Early optical observation at Xinglong
  20. GRB060218, optical observations
  21. GRB 060322: Confirmation of Swift XRT afterglow
  22. GRB 060211A: optical observation
  23. GRB060323: optical limit
  24. GRB060211B: optical observation
  25. GRB060323: NOT optical observations
  26. GRB 060322: IAC80 optical observations
  27. GRB 060322: Swift XRT afterglow candidate
  28. GRB 060323: Swift/UVOT Observations
  29. GRB 060323: optical afterglow confirmed
  30. GRB060323: NOT observations
  31. GRB 060323: Optical Observations
  32. GRB 060323: Tautenburg OT candidate retraction
  33. GRB 060323: Refined analysis of the Swift-BAT burst
  34. GRB 060323: optical observations at TNG
  35. GRB 060323: Swift XRT refined analysis
  36. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  37. GRB 060323: Swift/XRT position
  38. GRB 060322: Refined analysis of the Swift-BAT burst
  39. GRB060323 - SDSS Pre-Burst Observations
  40. GRB 060323: Swift detection of a burst with a possible optical afterglow
  41. GRB 060322: Swift-BAT detection of a 200-sec burst
  42. GRB060219: optical observation
  43. GRB060206: optical observation
  44. GRB060218/SN2006aj: optical observations
  45. GRB 060218/SN 2006aj, LNA optical observation
  46. GRB060218: Refined photometric calibration of comparison stars
  47. GRB 060319: WHT K-band candidate afterglow
  48. GRB 060319: IAC-80 optical observations
  49. GRB060319: Swift XRT refined analysis
  50. GRB 060319: Re-analysis of TNG data
  51. GRB060319: MASTER limit
  52. GRB 060319: Swift-BAT refined analysis
  53. GRB 060319 optical observations at TNG
  54. GRB060319 : Liverpool Telescope optical limit
  55. GRB060319: MASTER optical observation
  56. GRB060319 - SDSS Pre-burst Observations
  57. GRB 060319: Swift detection of a burst
  58. GRB060313: Radio Observations
  59. GRB 060313: early afterglow NIR upper limits with REM
  60. IBAS Alert n. 3221: not a GRB
  61. Konus-Wind observation of GRB 060313
  62. GRB060313: SSO 40inch Observations
  63. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  64. GRB 060313: PROMPT Observations
  65. GRB 060313: Swift/UVOT Observations
  66. GRB060313:Gemini South Observations
  67. GRB 060313: Swift-XRT team refined analysis
  68. GRB060313: optical observations of the afterglow candidate
  69. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  70. GRB 060313, SMARTS optical counterpart?
  71. GRB 060313: Possible optical counterpart
  72. GRB 060313: Swift XRT position
  73. GRB 060313, SMARTS optical/IR observations
  74. GRB060313: optical and near infrared observations with REM
  75. GRB 060313: Swift-BAT detection of a bright short hard burst
  76. GRB060218: SARA Observations of SN2006aj
  77. GRB 060312: Refined analysis of the Swift-BAT burst
  78. GRB 060218/SN 2006aj, high resolution spectra
  79. GRB 060312: Swift XRT team refined analysis
  80. GRB060306: APO Ks-band Imaging Observations
  81. GRB 060312: ROTSE-III Optical Limits
  82. GRB 060312: Swift detection of a burst
  83. IBAS Alert n. 3218 : not a real GRB
  84. GRB 060306: SOAR Ks Observations
  85. Bright short hard GRB 060303: IPN localization and Konus spectrum
  86. GRB 060306: MAGNUM observations
  87. GRB060218: analysis of the XMM-Newton observation
  88. Swift/UVOT observations of GRB060306
  89. GRB 060306: Swift-BAT refined analysis
  90. GRB 060306: Swift-XRT team refined analysis
  91. GRB 060306: PROMPT Observations
  92. GRB 060306: Swift detection of a bright burst
  93. GRB 060218: RTT150 optical observations
  94. GRB060223b: optical limit
  95. GRB060218/SN 2006aj: optical observation in V
  96. GRB060218/SN 2006aj: optical observation
  97. GRB 060121: HST observations
  98. GRB 060218 : GMRT observation [Correction and Improvement]
  99. GRB 060223b: Swift/UVOT Upper Limits
  100. GRB 060218/SN 2006aj: K-380 optical observations

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